CDLF Series Multistage Centrifugal Pump

The CDLF series is a vertical multistage centrifugal pump for thin, clean, non-flammable and non-explosive liquids that carry no solid particles or fibres. Its working span runs from tap water through to mildly corrosive industrial liquids, with published coverage of 2-162 m³/h at heads of 36-200 m and motor ratings of 1.1-132 kW. The overflow section is produced from stainless steel plate by stamping and welding, and the shaft seal uses hard alloy and fluororubber mechanical seal elements, which is what extends the pump into mildly corrosive service. The inlet and outlet sit on the same horizontal plane as the pump base, so the pump can be built directly into a pipeline run without an elbow set. A standard motor drives the pump shaft through a coupling, and an intelligent protector can be specified to guard against dry running, phase loss and overload.

The supplier publishes one parameter table for the CDL and CDLF family, giving head at eight flow points per model. The rows below show the rated duty point at 2 m³/h for each model in the published range.

• Reverse osmosis plants: Feeds RO membranes and ultrafiltration skids where the feed is thin and low in solids.
• Water supply systems: Plant filtration and delivery, zoned supply and high-rise pressure boosting.
• Industrial pressure boosting: Process water, cleaning and high-pressure washing systems.
• Distillation and treatment plant: Circulation and transfer duty on clean or mildly corrosive process water.
• HVAC and boiler systems: Cooling circuits, boiler feed water and condensate transfer.
• Irrigation systems: Sprinkler and drip irrigation where mild chemical addition is present.

• Check the medium against the published envelope: thin, clean and non-flammable, without solid particles or fibres.
• Where the liquid is mildly corrosive, confirm the stainless steel overflow parts and the hard alloy and fluororubber seal are adequate for the concentration involved.
• Read the eight-point head curve for the chosen model so the duty point sits inside the stable part of the curve.
• Provide a flooded suction or adequate NPSH margin, as the series is not self-priming.
• Decide whether the intelligent protector is required to cover dry running, phase loss and overload.